Author: Camilo Alfredo Garcia CelyPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Dark Matter Phenomenology in Scalar Extensions of the Standard Model
Author: Camilo Alfredo Garcia CelyPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Astrophysical and Phenomenological Implications of Bound States in Extensions of the Standard Model of Particle Physics
Author: Lauren Marie Wozniak PearcePublisher:
ISBN:
Category :
Languages : en
Pages : 196
Book Description
While the Standard Model of particle physics has undoubtedly been an experimental success, several questions remain unresolved. In particular, the Standard Model cannot account for the observed cosmological preference for matter over dark matter, nor does it provide a viable candidate for dark matter. This motivates us to consider extensions to the Standard Model; in this thesis, we will focus on several extensions of the Standard Model in which the formation of bound states is a significant factor. We will argue that the formation of bound states produces new phenomena that can address these unsettled questions. First, we consider a strongly-coupled version of the Minimal Supersymmetric Standard Model. We demonstrate that in this model, electroweak symmetry breaking may be triggered by the presence of squark bound states which mix with the fundamental Higgs boson. Next, we show that this model has a viable phenomenology (e.g., it does not have large flavor-changing-neutral-currents or break SUC(3) symmetry). Additionally, this strongly-coupled version of the MSSM can relatively easily accommodate electroweak scale baryogenesis. Following this, we turn our attention to the possibility of dark matter bound states in asymmetric dark matter models. We first consider a simplistic scalar model and demonstrate that bound state formation can produce a detectable gamma ray excess in certain regions of parameter space. This signal is produced through the decay of the dark force mediator whose emission necessarily accompanies bound state formation. Next, we consider models in which the dark matter self-interactions are described by a broken UD (1) gauge group. We argue that in such models dark matter is generically multi-component, consisting of two species of ions along with dark atoms. We then investigate the possibility of using these self-interactions between the different species to alleviate tension between the cold dark matter paradigm and observations of dwarf galaxies, while retaining the ellipticity of larger halos. Finally, we consider the formation and growth of Q-balls (non-topological solitons) in a simplified model inspired by the MSSM. In particular models, Q-balls can trigger a phase transition once they reach a critical size. In certain regions of parameter space, small charge Q-balls can be approximated using the Bethe-Salpeter equation. This allows us to study the growth of small Q-balls; by joining this to the semi-classical regime at large charges, we can analyze their growth from individual squarks to critical size. In our simplistic model, we show that Q-balls can indeed reach critical size on cosmological time scales.
Phenomenology of the Dark Matter Sector on the Two Higgs Doublet Model with Complex Scalar Singlet Extension
Author: J. DuttaHeavy WIMP Effective Theory
Author: Mikhail P. SolonPublisher: Springer
ISBN: 3319251996
Category : Science
Languages : en
Pages : 188
Book Description
This book is about dark matter’s particle nature and the implications of a new symmetry that appears when a hypothetical dark matter particle is heavy compared to known elementary particles. Dark matter exists and composes about 85% of the matter in the universe, but it cannot be explained in terms of the known elementary particles. Discovering dark matter's particle nature is one of the most pressing open problems in particle physics. This thesis derives the implications of a new symmetry that appears when the hypothetical dark matter particle is heavy compared to the known elementary particles, a situation which is well motivated by the null results of searches at the LHC and elsewhere. The new symmetry predicts a universal interaction between dark matter and ordinary matter, which in turn may be used to determine the event rate and detectable energy in dark matter direct detection experiments. The computation of heavy wino and higgsino dark matter presented in this work has become a benchmark for the field of direct detection. This thesis has also spawned a new field of investigation in dark matter indirect detection, determining heavy WIMP annihilation rates using effective field theory methods. It describes a new formalism for implementing Lorentz invariance constraints in nonrelativistic theories, with a surprising result at 1/M^4 order that contradicts the prevailing ansatz in the past 20 years of heavy quark literature. The author has also derived new perturbative QCD results to provide the definitive analysis of key Standard Model observables such as heavy quark scalar matrix elements of the nucleon. This is an influential thesis, with impacts in dark matter phenomenology, field theory formalism and precision hadronic physics.
Extensions of the Scalar Sector from Compositeness to Dark Matter and Back
Author: Lara MasonPublisher:
ISBN:
Category : Dark matter (Astronomy)
Languages : en
Pages : 0
Book Description
Electroweak Interactions and Unified Theories
Author: J. Thanh Van TranPublisher: Atlantica Séguier Frontières
ISBN: 9782863320556
Category : Dark matter (Astronomy)
Languages : en
Pages : 616
Book Description
Introduction to the Standard Model
Author: Stuart RabyPublisher: Cambridge University Press
ISBN: 1108494196
Category : Science
Languages : en
Pages : 637
Book Description
Develops a practical understanding of the theoretical concepts required to understand the Standard Model for a two-semester graduate course.
Dark Matter in Astro- and Particle Physics
Author: Hans-Volker Klapdor-KleingrothausPublisher: Springer Science & Business Media
ISBN: 354026373X
Category : Science
Languages : en
Pages : 678
Book Description
TheFifthHEIDELBERGInternationalConferenceonDarkMatterinAst- and Particle Physics, DARK 2004, took place at Texas A&M University, College Station Texas, USA, October 3–9, 2004. It was, after Cape Town 2002, the second conference of this series held outside Germany. The earlier meetings, starting in 1996, were held in Heidelberg. Dark Matter is still one of the most exciting and central ?elds of ast- physics, particle physics and cosmology. The conference covered, as usual for this series, a large range of topics, theoretical and experimental. Theoretical talks covered SUSY/SUGRA phenomenology, which provides at present a preferred theoretical framework for the existence of cold dark matter. Also included were other possible explanations of dark matter such as SUSY Q balls, exciting New Symmetries, etc. The most important experiments in the underground search for cold and hot dark matter were presented. Talks describing the current experimental dark matter bounds, what might be obtained in the near future, and the reach of future large (i.e. one ton) detectors were given. The potential of future colliders to correlate accelerator physics with dark matter searches was also outlined. Thus the reader will be able to see the present status and future prospects in the search for dark matter. The exciting astronomical evidence for dark matter and corresponding observations concerning the Milky Way’s black hole, high-redshift clusters, wakes in dark matter halos were other important topics at the conference.
Extensions of the Standard Model with Relation to Dark Matter and Flavor Structure
Author: Cynthia Simeonova TrendafilovaPublisher:
ISBN:
Category :
Languages : en
Pages : 158
Book Description
There is a great deal of observational evidence now suggesting the existence of dark matter as the major constituent of the matter content in our universe. Its nature and particle content are still a mystery, and proposing suitable models that can explain its properties would be of great value. This dissertation is a study of the phenomenology of dark matter models with a focus on flavor structure and the rich consequences it can have for the dark sector. We give three implementations of flavored dark matter (FDM) and discuss interesting phenomenological and observational consequences of each. The first model contains asymmetric lepton-flavored dark matter alongside a Higgs portal interaction, resulting in destructive interference that significantly weakens constraints from direct detection bounds. The second study implements a model where a present-day FDM relic can be symmetric, even though it was initially produced in the early universe with an asymmetry in each flavor transferred from the Standard Model via its FDM interactions. Finally, we explore a model where asymmetric DM components interacting via a long-range force can combine to form bound states, and the interactions between these components and a dark photon can address several outstanding issues from astrophysical observations
Flavored Dark Matter Beyond Minimal Flavor Violation
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 118
Book Description
We study the interplay of flavor and dark matter phenomenology for models of flavored dark matter interacting with quarks. We allow an arbitrary flavor structure in the coupling of dark matter with quarks. This coupling is assumed to be the only new source of violation of the Standard Model flavor symmetry extended by a U(3)x associated with the dark matter. We call this ansatz Dark Minimal Flavor Violation (DMFV) and highlight its various implications, including an unbroken discrete symmetry that can stabilize the dark matter. As an illustration we study a Dirac fermionic dark matter [chi] which transforms as triplet under U(3)x, and is a singlet under the Standard Model. The dark matter couples to right-handed down-type quarks via a colored scalar mediator [Phi] with a coupling [lambda]. We identify a number of "flavor-safe" scenarios for the structure of [lambda] which are beyond Minimal Flavor Violation. For dark matter and collider phenomenology we focus on the well-motivated case of b-flavored dark matter. The combined flavor and dark matter constraints on the parameter space of [lambda] turn out to be interesting intersections of the individual ones. LHC constraints on simplified models of squarks and sbottoms can be adapted to our case, and monojet searches can be relevant if the spectrum is compressed.